RESEARCH ON DEGRADATION CORROSIVE ENVIRONMENT OF SOME STEELS USED IN MANUFACTURING MINING EQUIPMENT. MICROSCOPIC ANALYSIS
Journal Title: Fiability & Durability - Year 2017, Vol 19, Issue 1
Abstract
By those shown in both the previous study and those presented in this paper we intend to deal with an unfavorable aspect, frequently found in surface mining workings of the coal basin of Oltenia. The excavating machines of these coal pits are subjected to difficult working conditions: dust (fine mineral particles with sizes up to 10μm or even less), temperature differences (in summer up to+50oC and in winter to-30oC), corrosive atmosphere (acid underground waters, sulfates, gases resulting from the extraction of coal - like SOx generated from calcination sulfides, nitrates), etc ... In terms of mobility, these machines are designed in such a way to adapt both to relief conditions (moving horizontally or in an inclined plane) and to larger or restricted spaces of maneuverability. Also they can move to different working fronts using the march mechanisms and the arms (of excavation ,respectively of overflowing) are mobile, may rotate both horizontally around the vertical axis of the machine and vertically around some own axes [1].
Authors and Affiliations
Ciofu Florin, Nioata Alin
Keywords
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